VL-ADR-01 Manual Datasheet

VL-ADR-01 USB to Audio Adapter OOOOOOOOOOO
Reference
Manual
DOC. REV. 03/13/2015
VL-ADR-01
USB to Audio Adapter
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VL-ADR-01 Reference Manual ii
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VL-ADR-01 Reference Manual 1
Overview
The VL-ADR-01 is a USB-to-audio adapter board. The board uses a Texas Instruments
PCM2906C codec to bring audio capabilities to embedded single board computers lacking audio
capabilities. As shown in Figure 3, the board provides the following controls and outputs:
Three volume control switches (Volume Up, Volume Down, and Mute)
Two 3.5 mm line-level audio connectors (stereo line input and stereo line output)
One 12-pin (2x6) 2 mm connector for off-board routing of controls, inputs, and outputs
Integrator’s Note:
The stereo line level output is limited to driving a 10 kΩ impedance load. This output should be
connected to an external amplifier to drive either headphones or speakers.
Ordering Information
VL-ADR-01S, temperature range of -25 ºC to +85 ºC
Accessories
The board connects to a host using a 0.5 m, USB 2.0 A plug to Micro-B plug cable, VersaLogic
part number VL-CBR-0503.
Dimensions
Figure 1 shows the dimensions of the VL-ADR-01.
Figure 1. Board Dimensions
Operating System Support
The VL-ADR-01 is compatible with standard USB audio driver code, typically embedded within an
operating system. No additional driver software is needed or supplied with the VL-ADR-01.
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VL-ADR-01 Reference Manual 2
Audio Signaling Characteristics
Table 1 lists the characteristics of the audio line-level signals on the audio jacks as well as the
auxiliary connector. For information on the audio characteristics of the PCM2906C codec, refer
to the following datasheet: http://www.ti.com/product/PCM2906C.
Table 1: Line-Level Signal Characteristics
Parameter Description
Audio input signal level 2 Vp-p (typical)
Input Impedance 30 kΩ (typical)
Output voltage level 2 Vp-p (typical)
Minimum output load impedance 10 kΩ
Transient Voltage Suppression (TVS) Devices
The ADR-01 circuitry is protected from spike and surge damage by on-board Transient Voltage
Suppression (TVS) devices on the audio line input and audio line output signals. Figure 2
provides a schematic view of the connection of the TVS devices.
Figure 2. Schematic of TVS Circuitry
ADR01_02
TVS Devices
Ground
Audio Output Right Channel
Audio Output Left Channel
Audio Input Right Channel
Audio Input Left Channel
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VL-ADR-01 Reference Manual 3
Integration
Connectors and Switches
Figure 3 shows the locations of the connectors and switches.
Figure 3. VL-ADR-01 Connectors and Switches
Table 2: VL-ADR-01 Connectors
Reference
Designator
Connector Description
J1 Auxiliary
12-pin (2x6) 2 mm connector
Can be used for remote cabling of audio in/out signals and volume control
switches. Refer to Table 4 and Figure 4 for additional information.
J2 USB Micro-B Connects the ADR-01 to a host/CPU board through a USB interface
J3 Line Input Stereo line-level input
J4 Line Output Stereo line-level output
Table 3: VL-ADR-01 Switches
Reference Designator Silkscreen Legend Description
S1 MUTE Mute
S2 VOL UP Volume up
S3 VOL DWN Volume down
Pm 2
VL-ADR-01 Reference Manual 4
Table 4: Auxiliary Connector Pin Description
Pin Signal Pin Signal
1 Mute switch (Note 1) 2 Mute input to codec (Note 2)
3 Volume Up switch (Note 1) 4 Volume Up input to codec (Note 2)
5 Volume Down switch (Note 1) 6 Volume Down input to codec (Note 2)
7 GND 8 Line input left
9 Line input right 10 GND
11 Line output right 12 Line output left
Notes:
1. This signal connects to a 1.5 kΩ pull-up resistor to either 3.3 V (when operating) or to 0 V (in USB
suspend mode.
2. The optional inputs to pins 2, 4, and 6 must be pulled up to 3.3 V using a 1.5 kΩ resistor (pins 1, 3,
and 5 are intended for this use but are not required to be used). They connect directly to the HID0,
HID1 and HID2 inputs on the PCM2906C. These inputs are intended to be driven by either a push-
button switch or an open-drain driver.
Figure 4. Pin Orientation of J1 Auxiliary Connector